Stove-board



UNITED STATES PATENT OFFICE.

A. IRVING GRIGGS, OF WESTFORD, NEIV YORK.

STOVE-BOARD.

sPECIPICATIQN forming part of Letters Patent No. 359,353, dated March15, 1887. Application filed November 14, 1856. Serial No. 182,802. (Nomodel To all whom it may concern:

.Be it known that I, A. Invrve Games, a citizen of the United. States,and a resident of Westford, in the county of Otsego and State of NewYork, have invented certain Improvements in Stove-Boards and theirManufacture, of which the followingis a specification.

My invention relates to the manufacture of stove-boards from sheetmetal; and the invention consists partly in the process of manufactureand partly in the product or stove-board as an improved article ofmanufacture.

The object of my invention is to produce a stiff, durable, cheap,andhandsome stove-board made from a single sheet of cheap materialnamely, tin-plate embossed throughout its entire extent; but thisembossed tin-plate being a very refractory material, the usual means forbeading the edge of the board cannot be employed, and, moreover, it isdesirable to have the embossing on the plate extend over and ornamentthe bead also, and this embossing would be obliterated or marred by thespinning up of the bead, even if this process were practicable.

Heretofore stove-boards have been made of sheets of brass and zinc,which are ductile metals and easily spun but brass is a costly materialand zinc is lacking in stiffness and durability. Such boards have alsobeen made from a sheet of tin cut to the proper shape, and a marginalstrip of a ductile metal seamed to the edge of the tin-plate to form theornamentalv bead. What is known as crystallized.tinplate, not embossed,has also been employed for making a stove-board, the edge of the plainplate being crimped down over the edge of a wooden backing.

I mention the above constructions in order to illustrate the state ofthe art up to the present time.

My invention in its entirety consists in first embossing the entiresurface of a sheet of tinplate large enough to form the board; thencutting this embossed sheet to the proper form for the board; thenpassing the margin of the plate through a series of beadingrolls,whereby the raw edge of the metal is turned under or hemmed down and araised molding or bead is formed on the edge or margin of the boardwithout appreciably marring the embossing in the raised and molded part,and then applying a coating of a non-vitreous composition or varnish tothe bright metallic upper surface of the board, which imparts to saidboard the color and luster of brass. I thus produce from the cheapergrades of heavy tin a stiff and durable board, which has the beauty andfinish of the more expensive and less durable brass boards.

The non-vitreous composition which I apply to my board is when dry veryhard, glossy, tough, and refractory, and its composition issubstantially as follows: To two parts, by measure, of linseed-oil andone part, by measure, of spirits of turpentine I add enough gum-copal orgum-dammar to give the properconsistency, and then add, as acoloring-matter, dragons-blood and gamboge in quantity sufficient toimpart the proper tint and color of brass. Dragons-blood imparts a moreor less coppery tint. This coating must be allowed to dry thoroughly,and artificial heat may be employed for the purpose.

Any composition that possesses the above qualities may be employed tocoat the board; but that above described will produce good results. Imay apply this composition before the plate is embossed, or after theboard is molded or beaded. I prefer to apply it after the heading.

. In the drawings, which serve to illustratemy invention, Figure l is aface view of a stove-board constructed according to my invention. Fig. 2is a. diametrical transverse section of the same on line 2 2 in Fig. 1.Fig. 3 is a fragmentary sectional view on a large scale, designedto-show the transparent no11- vitreous coating on the board.

a represents the molding on the margin of the board, over which, it willbe seen, the embossed pattern extends in a continuous manner.

b in Fig. 3 represents the coating on the face of the board, which givesthe latter the appearance of brass.

Having thus described my invention, I claim-- 1.The herein-describedmethod of making a stove-board from a single sheet of refractorytin-plate, which consists in first embossing the entire surface ofatin-plate of sufficient size to make the board, then cutting said plateto the proper size and shape for the board, and then forming on its edgeor margin a molding or raised bead without effaci n g the embossing onthe part forming said molding or bead.

2. The herein-described method of making a stove-board from a singlesheet of refractory tin-plate, which consists in first embossing theentire surface of a tin-plate of sufficient size to make the board, thencutting said plate to the proper size and shape for the board, thenforming on its edge or margin a molding or raised bead without effacingthe embossing on the part forming said molding or bead, and, lastly,applying to the face of said board a non-vitreous coating, as described,to impart to the board the color and luster of brass.

3. As an improved article of manufacture,

a stove-board constructed of a single sheet of embossed tin-plate with amolded edge, the embossed pattern of the plate extending continuonslyover the entire surface of said board and over the raised mold or beadon its edge, substantially as set forth.

4. As an improved article of manufacture, a stove-board constructed of asingle sheet of. embossed tin-plate with a molded edge, the embossedpattern of the plate extending continuously over the entire surface ofsaid board and over the raised mold or bead on its margin, and the faceof said board covered with a transparent non-vitreous varnish,asdescribed, whereby the color and luster of brass are imparted to theboard, substantially as set forth.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

A. IRVING GRIGGS.

\Vitnesses:

ARTHUR C. FRASER, GEO. BAINTON.

